Implement v0.4 subscriptions + v0.5 theming and plugin slots

- SSE and WebSocket fetchers via graphql-sse and graphql-ws,
  returning AsyncIterable results
- SessionStore.run consumes AsyncIterable streams with
  subscriptionMode "append" (timestamped) or "replace" and
  honors an AbortSignal for cancellation
- Chrome CSS variables documented in styles/theme.scss with
  prefers-color-scheme light/dark gating and .graphiql-light override
- Svelte 5 snippet slots on GraphiQL: toolbarExtras, tabExtras,
  resultFooter

1 files changed, 8 insertions, 1 deletions

diff --git a/source/library/index.ts b/source/library/index.ts
index 5aecff1..2bec6e4 100644
--- a/source/library/index.ts
+++ b/source/library/index.ts
@@ -24,5 +24,12 @@ export type {
 
 export type { HistoryEntry, HistoryInput } from "./state/history.svelte.ts";
 export type { OperationInfo } from "./graphql/operations.ts";
+export type { SseFetcherOptions } from "./fetcher/sse.ts";
 export type { Storage } from "./state/storage.ts";
-export type { Tab, TabSeed } from "./state/session.svelte.ts";
+export type {
+  RunOptions,
+  SubscriptionMode,
+  Tab,
+  TabSeed
+} from "./state/session.svelte.ts";
+export type { WsFetcherOptions } from "./fetcher/websocket.ts";